ABSTRACT
Synthesis of MgC92)O(4)â 2H(2)O nano particles was carried out by thermal double decomposition of solutions of oxalic acid dihydrate (C(2)H(2)O(4)â 2H(2)O) and Mg(OAc)(2)â (40H(2)O employing CATA-2R microwave reactor. Structural elucidation was carried out by employing X-ray diffraction (XRD), particle size and shape were studied by transmission electron microscopy (TEM) and nature of bonding was investigated by optical absorption and near-infrared (NIR) spectral studies. The powder resulting from this method is pure and possesses distorted rhombic octahedral structure. The synthesized nano rod is 80 nm in diameter and 549 nm in length.
Subject(s)
Nanoparticles/chemistry , Oxalic Acid/chemistry , Crystallization , Nanoparticles/ultrastructure , Spectroscopy, Near-Infrared , X-Ray DiffractionABSTRACT
A voglite mineral sample of Volrite Canyon #1 mine, Frey Point, White Canyon Mine District, San Juan County, Utah, USA is used in the present study. An EPR study on powdered sample confirms the presence of Mn(II) and Cu(II). Optical absorption spectral results are due to Cu(II) which is in distorted octahedron. NIR results are indicating the presence of water fundamentals.
Subject(s)
Minerals/chemistry , Optical Phenomena , Electron Spin Resonance Spectroscopy , Spectrophotometry, Ultraviolet , Spectroscopy, Near-Infrared , TemperatureABSTRACT
Apjohnite, a naturally occurring Mn-bearing pseudo-alum from Terlano, Bolzano, Italy, has been characterized by EPR, optical, IR and Raman spectroscopy. The optical spectrum exhibits a number of electronic bands around 400 nm due to Mn(II) ion in apjohnite. From EPR studies, the parameters derived, g=2.0 and A=8.82 mT, confirm MnO(H(2)O)(5) distorted octahedra. The presence of iron impurity in the mineral is reflected by a broad band centered around 8400 cm(-1) in the NIR spectrum. A complex band profile appears strongly both in IR and Raman spectra with four component bands around 1100 cm(-1) due to the reduction of symmetry for sulphate ion in the mineral. A strong pair of IR bands at 1681 and 1619 cm(-1) with variable intensity is a proof for the presence of water in two states in the structure of apjohnite.
